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chromium/third_party/blink/web_tests/fast/forms/color-scheme/color/color-suggestion-picker-appearance-with-scrollbar.html 

<!DOCTYPE html>
<meta name=fuzzy content="maxDifference=0-3; totalPixels=0-1000">
<meta name="color-scheme" content="light dark">
<script src="../../../../resources/testdriver.js"></script>
<script src="../../../../resources/testdriver-vendor.js"></script>
<script src="../../resources/picker-common.js"></script>

<input type='color' value='#ff0000' list='many'>
<datalist id='many'>
  <option>#000000</option>
  <option>#070707</option>
  <option>#0e0e0e</option>
  <option>#151515</option>
  <option>#1d1d1d</option>
  <option>#242424</option>
  <option>#2b2b2b</option>
  <option>#333333</option>
  <option>#3a3a3a</option>
  <option>#414141</option>
  <option>#484848</option>
  <option>#505050</option>
  <option>#575757</option>
  <option>#5e5e5e</option>
  <option>#666666</option>
  <option>#6d6d6d</option>
  <option>#747474</option>
  <option>#7b7b7b</option>
  <option>#838383</option>
  <option>#8a8a8a</option>
  <option>#919191</option>
  <option>#999999</option>
  <option>#a0a0a0</option>
  <option>#a7a7a7</option>
  <option>#aeaeae</option>
  <option>#b6b6b6</option>
  <option>#bdbdbd</option>
  <option>#c4c4c4</option>
  <option>#cccccc</option>
  <option>#d3d3d3</option>
  <option>#dadada</option>
  <option>#e1e1e1</option>
  <option>#e9e9e9</option>
  <option>#f0f0f0</option>
  <option>#f7f7f7</option>
  <option>#ffffff</option>
</datalist>

<script>
  window.onload = openPickerAppearanceOnly(document.querySelector('input'));
</script>